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Principles of Communication Systems Simulation with Wireless Applications by Kurt L. Kosbar, William H. Tranter, Theodore S. Rappaport, K. Sam Shanmugan

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Chapter 13. Modeling and Simulation of Time-Varying Systems

Up to this point in our studies, all components in the system under study, and the resulting models for those components, have been fixed or time-invariant. Linear time-invariant (LTIV) models, and their application to the modeling and simulation of system elements such as filters, were discussed in detail in the preceding chapters. Linear elements in a communication system can be time invariant or time varying in nature. We now remove the restriction of time invariance and turn our attention to the modeling and simulation of time-varying systems. As we will see, there are many examples of time-varying systems. Of particular interest later in our studies, will be the time-varying channel ...

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